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Gas purging is a process of displacing one gas by another gas. It occurs on a routine basis in the natural gas industry when pipelines are purged into and out of service. Purge gas is used to displace the contents of a container. To avoid flammable mixtures, the purge gas is usually inert except in certain instances where the relatively small area of contact allows the amount of flammable mixture to be minimized and controlled satisfactorily. The most common purge gases commercially …